Resolved secure Plesk hostname on port 8443 with an SSL certificate Let's Encrypt ERROR

[Butcher]

Server operating system version

CentOS Linux 7.9.2009 (Core)

Plesk version and microupdate number

Version 18.0.51

My situation is like this:

1. I have subdomain ex: plesk.mydomain.com that points to IP addres of plesk obsidian (record A shows good IP - checked)

2. I want to acces plesk plesk.mydomain.com:8443 - and secure that with SSL

3. So I do what I supposed to do according to this:

https://support.plesk.com/hc/en-us/articles/213954265-How-to-secure-a-Plesk-hostname-on-port-8443-with-an-SSL-certificate-Let-s-Encrypt-other-certificate-authorities-

4. but when I do step 3 - Click Let's Encrypt.

I got Error message:

Error: Could not find valid hostname

I have looked but can not find the reason and do not know how to make it work.

I work on:

Version	Plesk Obsidian v18.0.51_build1800230310.09 os_CentOS 7
OS	CentOS Linux 7.9.2009 (Core)

Note:
currently in Tools and settings -> SLL Certificates I see default certificate with details like this:

...

A self-signed certificate is an identity certificate signed by its own creator. If you use such a certificate, it means that you yourself verify your sites' identity. Although self-signed certificates allow the usage of SSL/TLS, they are trusted less, and considered as less secure.

Bits

2048

Country

Switzerland

State or province



Location (city)

Schaffhausen

Organization name (company)

Plesk

Organization department or division name



Domain name

Plesk

Email

info@plesk.com

Upload the certificate files​

 

[Kaspar]

Is plesk.mydomain.com the hostname set on Tools & Settings > System settings?

 

[Butcher]

You mean in Server Settings.
And no it was not !
WELL DONE thank you very much - works like charm now.

By the way it would be good if it was mentioned in PLESK tutorial to check that setting.